Update README.md

Author: davidflowers

README.md

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 # mla_usb
+mla_usb is the USB library from the Microchip Libraries for Applications (MLA) distribution.  The full MLA distribution and additional information can be found at www.microchip.com/mla.
+
+## License
+This library is licensed under the Apache v2 license (see "LICENSE" file in root directory of the repository).  To request to license this code under the MLA license (www.microchip.com/mla_license), please contact [email protected].
+
+## Product Support
+This library supports the following Microchip product lines:
+* PIC16F
+* PIC18F
+* PIC24F
+* PIC24E
+* dsPIC33E
+
+For the PIC32 USB support, please visit http://www.microchip.com/harmony.
+
+## Folder Structure
+* src - the source files (.c) that make up implementation and any private interface files (.h) local to the library.
+* inc - the public interface files (.h)
+* doc - the compiled documentation how to use this library.
+* doc-o-matic - the documentation source files used in conjunction with the '/src' and '/inc' files to generate the output in the '/doc' folder.